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Employee Benefit Plans - Narrative (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Minimum | Mar. 31, 2013 Maximum | Mar. 31, 2013 Other Postretirement Benefits plan | Oct. 31, 2011 Western Conference of Teamsters Pension Plan | Mar. 31, 2013 Labor Management Pension Fund | Dec. 31, 2011 Labor Management Pension Fund | Dec. 31, 2012 Labor Management Pension Fund quarter
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Withdrawal obligation |  |  |  |  |  | $ 0 |  |  | $ 4.3
Quarterly installment payments on estimated withdrawal liability |  |  |  |  |  |  |  | 0.1 |
Number of quarters relating to installment payments on estimated withdrawal liability |  |  |  |  |  |  |  |  | 80
Determination period relating to withdrawal liability |  |  |  |  |  |  | 24 months |  |
Number of non-pension multiemployer plans that the Company participates in |  |  |  |  | 5 |  |  |  |
Hours required for plan qualification |  |  | 1000 hours |  |  |  |  |  |
Elective employee contribution, as a percentage of their annual pay, range |  |  | 1.00% | 100.00% |  |  |  |  |
Percentage of employee contribution eligible for Company matching | 50.00% |  |  |  |  |  |  |  |
Company contribution, maximum percentage of employee's eligible income | 6.00% |  |  |  |  |  |  |  |
Plan periodic vesting percentage | 20.00% |  |  |  |  |  |  |  |
Plan, periodic vesting period | 5 years |  |  |  |  |  |  |  |
Automatic vesting age | 65 years |  |  |  |  |  |  |  |
Current employees, percent vested | 100.00% |  |  |  |  |  |  |  |
Matching contributions recorded by Company | $ 0.8 | $ 0.9 |  |  |  |  |  |  |

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- Definition Defined Contribution Plan, Elective Employee Contribution, Percent + References No definition available. + Details
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- Definition Defined Contribution Plan, Minimum Qualification Requirements, Work Period + References No definition available. + Details
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- Definition Multiemployer Plans, Number of Plans + References No definition available. + Details
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- Definition Multiemployer Plans, Withdrawal Obligation, Determination Period + References No definition available. + Details
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- Details
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